The focusing screen area of Hasselblad 500 (or V) Series covers a 6x6 frame. This represents what one would get from a standard frame shot with an A12 film back (also technically something shot with an Instax Square back as well). I am lucky enough to have both an A16 film back and a CFV 100c back as well, but those don't cover the whole frame. Both are 6:4.5 ratio but slightly different sizes, so I modeled in the two framings inside a frame that would fit on top of the focusing screen of my 500C/M.

I have so far found it super useful for framing my shots instead of guessing where my shot would be inside the focusing screen.

I got a few requests to upload the model, so here it is! Hope you enjoy!